WiFi has the csmak mechanism as part of the protocol. Basically you have to listen for clear air before you can talk. If they air isn’t clear you don’t transmit. With a poling mechanism you transmit no matter what, if there’s no acknowledgment you transmit again, no matter what.
WiFi is inherently susceptible to interference issues. That’s how it is so nicely co-locateable but it’s also bad for high noise environments. The idea that anyone will put hundreds or thousands of units on the street and do even an OK job of servicing the consumers with today’s protocol is funny to me. It works now, but so did muni wifi not that long ago. This too shall pass.... marlon From: Matt Hoppes Sent: Wednesday, November 27, 2013 12:32 PM To: WISPA General List Cc: WISPA General List Subject: Re: [WISPA] Comcast asking FCC for more 5GHz spectrum. ? On Nov 27, 2013, at 14:51, "Marlon Schafer (509.982.2181)" <[email protected]> wrote: The other good thing is that they will (hopefully) keep using wifi where we can use polling mechanisms easier today so we *should* be more protected against the interference than we used to be with older 2.4 gig gear. marlon From: Scott Carullo Sent: Thursday, November 14, 2013 3:52 PM To: Matt Hoppes ; [email protected] ; WISPA General List Subject: Re: [WISPA] Comcast asking FCC for more 5GHz spectrum. Hard to tell, noise floor is noise floor which keeps creeping up - we all know things work better when its quiet. This used to worry me a lot when I saw it coming, but then I realized it was already there and I had no idea until I just happened to scan on some radios (I don't usually install the stuff). I'm not worried any more, if its not one thing it will be another any way. Thats what gives us the edge every day, flexibility. We will work around it, we always do. I figure a high gain antenna on a tower with a good directional CPE will continue to work fine. Their omni low gain antenna can't compete with a 20-30db directional one. Still sucks though, you drive down the street and see one after another running 5Ghz just knowing there probably isn't 3 connections in the whole city to them.... Scott Carullo Technical Operations 855-FLSPEED x102 ------------------------------------------------------------------------------ From: "Matt Hoppes" <[email protected]> Sent: Thursday, November 14, 2013 6:43 PM To: "[email protected]" <[email protected]>, "WISPA General List" <[email protected]> Cc: "WISPA General List" <[email protected]> Subject: Re: [WISPA] Comcast asking FCC for more 5GHz spectrum. Are you seeing any impact from them? On Nov 14, 2013, at 18:03, "Scott Carullo" <[email protected]> wrote: Yeah, won't matter either way with a 5Ghz AP on every street corner. Already seeing that in our areas.... do a wireless scan and you see 354 5Ghz APs now in addition to the 2Ghz ones (they run dual band APs now). Scott Carullo Technical Operations 855-FLSPEED x102 ---------------------------------------------------------------------------- From: "Bret Clark" <[email protected]> Sent: Thursday, November 14, 2013 5:49 PM To: [email protected] Subject: Re: [WISPA] Comcast asking FCC for more 5GHz spectrum. What could go wrong with Comcast taking up yet more 5GHz of spectrum...[/sarcasm off] On 11/14/2013 01:40 PM, ralph wrote: I hope the links at the bottom come through. --------------------------------------------------------------- Comcast needs the FCC to open up the 5 GHz spectrum band to power next-generation Wi-Fi services that could allow it to deliver wireless broadband at speeds of up to 1 Gbps, SVP of Business Development Tom Nagel testified at a House Energy and Commerce hearing on Wednesday. Nagel disclosed in his prepared testimony that Comcast has expanded the number of Wi-Fi access points for Xfinity high-speed Internet customers to 350,000. The nation's largest cable MSO also began deploying wireless gateways from Cisco earlier this year that Comcast has said may be able to power millions of neighborhood hotspots. While Comcast already is already using the 5 GHz band, Nagel said it needs more of the unlicensed spectrum to meet demand from subscribers for Wi-Fi. It faces potential opposition from Toyota and other automobile manufacturers who want to use the 5 GHz band to deliver next-generation connected car applications, including applications that would warn drivers of collision threats. Toyota principal researcher John Kenney raised concerns about possible interference from Wi-Fi services at Wednesday's hearing. "We have been actively engaged with the Wi-Fi community and other stakeholders who are exploring possible sharing solutions that will alleviate any risk of harmful interference from unlicensed devices. But we're not there yet and it's going to take a bit more time to see if we can get there," Kenney said in his prepared testimony. For more: - see Nagel's prepared testimony (.pdf) - see Kenney's prepared testimony (.pdf) - see Comcast blog post - Broadcasting & Cable has this story _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless ------------------------------------------------------------------------------ _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless -------------------------------------------------------------------------------- _______________________________________________ Wireless mailing list [email protected] http://lists.wispa.org/mailman/listinfo/wireless
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